Rock-drill.



Patented Oct. 2 I9 A. M. souTHAmJ. no

ROCK DRILL.

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N0. 659,l85. Y Patented Oct. 2, |900. A. M. SOUTHARD.

ROCK DRILL.

(Application tiled Apr. 22, 189B.) (No Model.) 3 Sheets-Sheet 2.

No. 659,185. Patented Get. 2, |900.

A. M. SUUTHNRD.

ROCK DRILL.

Application med Apr. 22, 189s.) (No Model.) 3 Sheets-Sheet 3.

W 5555 [N VEN TOR. @g c 50a/Mara BY' j UNirn *raras PATENT OFFICE.

ABRAHAM M. SOUTHARD, OF DENVER, COLORADO, ASSIGNOR TO CHARLES YV. PRATT, OF SAME PLACE.

Roo'KfDRILL.

SPECIFICATION forming'vpart of Letters 4Patent No. 659,185, dated October 2. 1900.

Application filed April Z2, l898 To @ZZ whom t may concern,.-

- Be i t known that I, ABRAHAM M. SOUTHARD, a citizen of the United States of America, residing at Denver, in the county of Arapahoe and State of Colorado, have invented certain new and usefulmprovements in Rock-Drills; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art ,to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures .if reference marked thereon, which form a part of this specification.

, My invention relates to improvements in rock-drills of the class set forth in Letters Patent No. 585,795, issued to me July 6, 1897.

` My present invention consists of certain 1 improvements on the construction set forth n the aforesaid patent, as hereinafter der scribed and claimed, all of which will be fully l understood by reference to the accompanying drawings, in which is illustrated an embodiment thereof.

f ln the drawings, Figure 1 is a longitudinal section taken through the mechanism on the lineaccc, Fig. 4, looking upward. Fig. 2 isa detail showing the clamp-releasing mechanism in elevation on a larger scale. Fig. 3 is a seotion taken on the line y y, Fig. 2. Fig. 4 is a section taken on theline w w, Fig. 1. Fig. 5 is a fragmentary side elevation of the mechanism shown in Fig. 4. Fig. 6 is a section taken on the line o o, Fig. l, looking toward the right. Fig. 7 is a section taken on the line s s, Fig. 1, looking toward the left. Fig. 8 is a perspective view illustrating the clamp-releasing jaws separated. Fig. 9 is a top View showing the elampreleasing jaws connected.

Fig. 10 is an underneath view of the'same.

Fig. 11 is a fragmentary section illustrating the mechanism for regulating the tension of the power-spring and also the mechanism for rot-ating the drill-shaft. Fig. 12 is a crosssection taken on the line A A, Fig. 11. Fig.

13 is a section taken on the line B B, Fig. 11.

Fig. 14 is a fragmentary perspective View of one of the rods provided with the bevel-faced tongues.

Similar reference characters indicating corresponding parts in the views, let the numeral 5 designate the casing, having end heads 6 Serial No. 678,483. (No model.)

` and 7, provided with openings through which each rack-bar is a dog 13, carrying an antifriction-roller 13, which engages a lockingdisk 15, mounted on the drill-shaft 8. Immediatelyin the rear of the disk 15 is the clamping mechanism, comprising a collar 16, a plurality of levers 17, a collar 18, a number of segmental shoes 19, and a small plate 2O for each lever. The shoes 19 engage the shaft 8, against which they are forced by the levers 17, whose forward extremities bear against the shoes. The plates 20 are engaged by fulcrum projections formed on the levers near their forward extremities. The rear extremities of the levers 17 are provided with inclined or beveled inner faces, which are engaged by antifriction-rollers 18a, carried by the collar 18.

The power-spring 21 surrounds the shaft8 and its forward extremity bears against the collar 18. The opposite extremity of this spring engages a tension-collar 22, having rearwardly-extending flanges, which overlap the adjacent extremities of apair of dogs 23, fulcrumed at 28 on a sleeve 29, surrounding a toothed shank 26a, formed integral with a cogged wheel26, located adjacent to the rear head 6, between which and said wheel are interposed ball-bearings 27,engaging suitable raceways formed in .the said parts. The sleeve 29 is slotted to allow the dog extremities to engage the toothed portion of the shank 26a. The tails of the dogs project into the cam-slots 22a, formed in the collar 22. The collar 22, as shown in Fg. 6, is connected with the sleeve 29 by a screw 30, which passes through a slot formed in the collar. The object of this slot is to allow the collar apartial rotation, whereby the cam-walls of the slots 22a act on the tails of the dogs suficiently to disengage their noses from the teeth of the shank 26a when it is desired to adjust the tension devices. The noses of the dogs are held normally in engagement IOO with the teeth of the shank by coil-springs 3l,seated in recesses formed in the sleeve 29 and bearing against the dogs forward of the fulcrum. The periphery of the collar 22 is provided with lugs 22C for convenience in turning. The sleeve 2S) is connected with the shank 26 of the wheel 26 by a screw 32, which projects into alongitudinal groove 33, formed in the shank. This feature permits the longitudinal movement of the tension devices while the cogged wheel and its shank remain stationary. The tension-collar and its attachments may be moved forward or toward the left, referring to Fig. l, for the purpose of increasing the tension of the spring by inserting an instrument and pressing the collar in the propel' direction. This collar may be moved rearwardly for the purpose of reducing the tension of the spring by first giving the collar 22 a partial turn and disengaging the dogs from the teeth of the shank 26a, as heretofore explained.

To the rear extremity of each cogged rack is attached a rod 25 by means of a bolt 24. This rod protrudes through the rear head of the casing and enters a closed housing 5, which conceals the rod from external view. The wheel 2(3fis splined on the shaft S, whereby the latter is allowed to move through the wheel longitudinally. The wheel and shaft, however, must rotate together. This rotation is accomplished through the instrumen tality of two tongues 251 and 25C, having beveled faces A and B, respectively. The tongue 25 is located forward of the tongue 25C, and the two tongues are not in line with each other. The beveled extremities of these tongues are separated by a space 25d. As one of the cogged racks moves forward the face B of the tongue 25c engages a cog of the gear 26 and imparts a partial rotary movement to the shaft (3. Simultaneously with this action of the tongue 25c of the one rod is the action of the tongue 25L of the other rod, whose face A d uring the backward movement engages a cog of the wheel and coperates with the face B of the tongue on the other rod in rotating the wheel and the shaft. The rods 25, being arranged on opposite sides of the gear, are so located that the tongue 25t of the one rod and the tongue 25c of the other rod cooperate in imparting the necessary partial rotary movement to the drill-shaft.

The action of the tongues 25 and 25Q is substantially the same as set forth in my previous patent, No. 585,795, dated July 6, 1897, and therefore need not be further set forth in detail.

The mutilated gear is jou rnaled in the casing and operated by a hand-lever12, attached to the journal of the gear. This lever may be made to occupy any desired position by means of a clutch composed of two members 3 and 4. When each cogged rack reaches its backward limit of movement, a roller 13, mounted on the rear extremity of the dog 13,

engages an inclined stop 36, mounted on the casing. This stop causes the dog extremity to move inwardly sufficiently to release the roller 13a from the locking-disk 15. The recoil of the spring then acts ou the clamping mechanism, heretofore described, and drives the shaft 8 forward.

To the inner surface of the front head 7 of the casing is attached a sleeve 37 by means of bolts 38. Between this sleeve and the locking-disk 15 is located a rubber washer 35, which yields sniciently when it strikes the sleeve 37 to prevent injury to the parts from jar or concussion. When the shaft reaches its forward limit of movement, the power of the spring is practically spent and the pressure on the collar 18 is reduced sufficiently to allow the shaft to feed automatically through the clamping-shoes 19, thus avoiding the necessity of special feed mechanism.

In. order to adjust the reciprocating drillshaft longitudinally in the casing-for instance. to draw it back after it has been fed through the required distance-the clampreleasing mechanism (illustrated in Figs. 2, 3, 8, 9, and 10) is brought into requisition and will now be described. This mechanism consists of two pairs of jaws 41 and 42 and a forked lever 43 for operating the said jaws. The jaw 41 is connected with the drill-casing by a pin 44, passing through an aperture formed in t-he rear extremity of the jaw and upon which the latter is pivoted. This jaw 41 is provided with a slot composed of a straight portion 41 and .an angular portion 41C. The jaw 41 is further provided with a slot 41d, formed in its forward portion. The jaw 42 occupies a position above the jaw 41, upon which it is adapted to slide. The two jaws are connected by a bolt 45, passing through an opening 42, formed in the jaw 42, and .the slot 41d of the jaw 41. The bolt is fastened by a nut and lits the opening 42 in the jaw 42 and is adapted to slide in the slot 41d of the jaw 41. The jaw 42 is further provided with a short slot 42, formed in its rear portion. This slot 42c is about equal in length to that of the angular portion 41C in the slot of the jaw 41. The lever 43 is pro vided with two arms 43a. The upper extremity of each of these arms passes through the rearward slots of a pair of jaws 41 and 42. Each pair of jaws normally occupies the outward dotted-line position in Fig. 2.

\Vhen it is desired to release the drill-shaft 8 from the action of the levers 17 and the shoes 19, the depending arm 43C of the lever 43 is moved forwardly or toward the left, (referring to Fig. 2,) whereby the forked eX- tremities 43 are thrust rearwardly or in the opposite direction. As the said arms move toward the rear each engages the inner inclined face of the slot part 41c and thrusts the two jaws inwardly to the position shown in full lines in Fig. 2. The lever-arm extremity during this movement of the two jaws travels in the slot 42c of the jaw 42; but when the inward movement of the jaws is com plete-that is to say, when the hooked extremity of the jaw 41 occ'u pies a position to the rear of and engagiligtlie collar 16 and the jaw 42 in front of and engaging the col- Alar l-the lever-arm extremity reaches the rearward end of the slot 42C, and asv the said lever-arm extremity continues to move in the same direction the jaw 42 is thrust rearwardly, carrying the collar 18 with it, as shown by dotted lines inltlig.v 2. During this movement the jaw 42 slides on the jaw 41',` the bolt 45 moves in the slot 41dof'the jaw 41, and the lever-arm extremity moves in the straight portion 4,1a of the rearward slot in the jaw 41. l-lence after the jaw 41 reaches the position shown in full lines in Fig. 2 it holds the collar 16 from movement, while the collar 18 is thrust backward to the dotted-line position. Then the collar 18 is in the last-named position, the shoes 19 cease to grip the drillshaft and the latter may be moved in either direction at will. rlhe lever 43 is fulcrumed on the casingat 43d, and it is provided with.

a locking-dog 46, adapted to hold the lever in either position of adjustment. After the drill-shaft has been adjusted as required and it is desired that the clamping mechanism againv act upon it the lever 43 is shifted to its original position and the movement of the jaws41 and 42, as just described, is reversed. .l Y

The means for tipping the drill mechanism from the upright position shown in Fig. 4 to the one side or the other, as may be required to permit access to the hole in the rock for the purpose of cleaning' it out, will now he described.

To the bottom ofthe casing is attached a lug 52, which is pivot-ally connected, as shown at 52, with a lug 53, mounted upon a clamp 58, adapted to be attached to a supportingbar. (Not shown.) To each side of the casing is hinged, as shown at 56, a clampingplate 54, in which is journaled a set-bolt 55, whose threaded extremity engages a threaded socket formed in the lug 52. The lower extremity of each plate 54 is adapted to engage a beveled or inclined face 53a, formed on the lug 53. Hence as the set-bolts are screwed into the said openings the plates 54 are made to` grip the lug 53 tightly. When it is desired to tip the drill-casing to one side or the other, it is only necessary to unscrew the set-bolt on that side until it isv removed from the threaded socketinthe lug 52. The plate 54 may then be swung outwardly, whereby it is disengaged from the face 53a of the lug 53'. It is evident that the drill-casing may then be tipped to one side. Each bolt 55 is provided with a head 55a, fastened to the bolt by a pin 55C. This head bears against the plate 54 exteriorly. The bolt is provided with a shoulder 55d, which engages the plate interiorly. Hence the bolt has no longitudinal movement in the plate, but turns freely therein. This is an essential feature in order that the best results may be obtained from my improved mechanism.

Having thus described my invention, what I claim is- 1; In a rock-drill, the combination with the 'the shaft, shoes located in the collar and engaging the shaft, gripping-levers engaging the Shoes, another collar engaging the levers and against which the power-spring presses, normally causing the levers to grip the shoes, a clamp-releasing mechanism comprising two connected jaws one being pivoted on the casing, and the other being adapted to slide on the pivoted jaw, and a lever having an arm passing through slots formed in the two jaws,

one slot having an angular and a straight portion, and the other slot being shorter,whereby as the lever-arm moves through the angular portion of the one slot, the two jaws are forced inwardly to engage the two collars, after which the lever-arm forces the jaw containing the short slot rearwardly thrusting the collar against the spring, thereby releasing'the shaft. from the action of the grippinglevers.

3. In a rock-drill, the combination with the drill-shaft and the power-spring surrounding the shaft, of two separated collars surrounding the shaft, one collar being engaged by the power-spring, gripping-levers connecting the two collars, and releasing mechanism comprising two jaws 41 and 42 adapted to hold one collar, while the other is forced rearwardly against the spring and the gripping-levers released, the two jaws being connected by a bolt passing through a slot in the jaw 4l and fitting an opening in the jaw 42, whereby the one jaw is adapted to slide on the other, the jaw 41 being pivoted on the casing and provided with a slot composed of an angular and a straight portion, the jaw 42 being plovided with a shorter slot registering with the slot in the jaw 41, a lever having an arm entering the registering slots of the two jaws, whereby they are actuated for the purpose set forth.

4. In a rock-drill, the combination of the reciprocating shaft and the power-spring surrounding the shaft, of a tension-collar surrounding the shaft and engaging the powerspring, a sleeve connected with the collar, the latter being adapted to turn on the sleeve, a dog fulcrumed on the sleeve and having one extremity projecting into a cam slot IOO IIO

formed in the collar, and a toothed shank splined on the shaft and which the opposite extremity of the dog is adapted to engage.

5. In a rock-drill, the combination of the reciprocating shaft and the power-spring surrounding the shaft, of a tension-collar surrounding the shaft and engaging the powerspring, a sleeve connected with the collar, the latter being adapted to turn on the sleeve, a dog fulerulned on the sleeve and having one extremity projecting into a cam slot formed in the collar, and a toothed shank splined on the shaft and which the opposite extremity of the dog is adapted to engage, the sleeve bengeonnected with the shank by a screw passing through thesleeve and engaging a longitudinal groove formed in the shank.

6. The combination with the drill-easing provided with a lug, of a supporting-lug with which the casing-lug is pivotally connected,

a plate hinged to the easing and adapted to engage the supporting-lug, and a set-bolt journaled in the plate and adapted to engage a threaded opening in the casing-lug, for the purpose set forth.

7. The combination with the drill-casing provided with a projection, of supporting means upon which the casing projection is pivotally mounted, a plate hinged to eaeh side of the casing and adapted to engage the Correcfon in Letters Patent No. 659,135-

It is hereby certified that the name of the assignee in Letters Patent No. 659,185, granted October 2, 1900, upon the application of Abraham M. Southard, Colorado, for an improvement in Rock-Drills, Charles W. Pratt,

II. Pratt; and that the said Letters Patent should be read with this correction therein of Denver, Was erroneously Written and printed Whereas said name should have been Written and printed Charles that the same may conform to the record of the case in the Patent Office.

Signed, countersigned, and sealed this 30th day of October, A. D., 1900.

[SEAL] F. L. CAMPBELL,

Assistant Secretary of the Interior. Uonntersigned C. H. DUELL,

Ommnssoner of Patents. 

